Scheme of generation of the radiation with ZS at the instant marked by a dashed line in Fig. 1. Electron cyclotron frequency f_Be and harmonics of ion cyclotron frequency sf_Bi with harmonic s varying from2 to 8 as function of the distance r = R∕R_J from the planet center along the active magnetic tube (λ_Io = 117°) are shown. Horizontal solid lines denote the frequency of observed zebra stripes f_zp. The regions where f_Be = f_zp are marked by circles on the f_zp lines. The DPR regions are marked by filled circles on the sf_Bi curves. Starson the r axis show the distances at which the DPR regions at the harmonics s varying 2 to6 are located.